Mouth blown air-sealed body with automatically opened air inlet

Abstract

A postal envelope bag having a cushioning function includes two outer films, two inner films, heat resisting materials, transverse heat-sealing lines, longitudinal heat-sealing lines, air columns, neck heat-sealing lines, an air filling passage, air inlets and heat-sealing blocks, where air entering the air-filling port expands the air filling passage, the two outer films are pulled apart outward in a longitudinal direction and are contracted in a transverse direction; the heat-sealing blocks thrusts the two inner films, the portions of the two inner films coated with the heat resisting material are pulled apart outward in the longitudinal direction, and third segments drives the two inner films to open the air inlet as the two outer films are pulled apart outward in the longitudinal direction; after entering the air column, the air presses the second sides of the two inner films to close the air column.

What is claimed is: 
     
       1. A mouth-blown air-sealed body with an automatically opened air inlet, comprising:
 two outer films, stacked together vertically; 
 two inner films, positioned between the two outer films, wherein each of the inner films comprises a first side and a second side opposite to each other; 
 a plurality of heat resisting materials, coated between the first sides of the two inner films; 
 a plurality of transverse heat-sealing lines, adhering to two sides of the two outer films; 
 a plurality of longitudinal heat-sealing lines, adhering to the two outer films and the two inner films; 
 a plurality of air columns, wherein each of the air columns is located between the two outer films of two adjacent longitudinal heat-sealing lines; 
 a plurality of neck heat-sealing lines, located between the transverse heat-sealing lines, wherein each of the neck heat-sealing lines is corresponding to one of the air columns and comprises:
 two first segments, respectively connected to two adjacent longitudinal heat-sealing lines; 
 two second segments, respectively connected to the first segments, and extending toward a direction far away the air columns, wherein at least one part of the two second segments is located at portions of the two inner films coated with the heat resisting materials; and 
 a third segment, connected to the two second segments, and located at the portions of the two inner films coated with the heat resisting materials, where, the neck heat-sealing line located at the portions of the two inner films coated with the heat resisting materials adheres to one of the outer films and one of the inner films adjacent to each other; 
 
 an air filling passage, located at a space in the two outer films between one of the transverse heat-sealing lines and one of the neck heat-sealing lines, and comprising an air-filling port capable of filling air; 
 a plurality of air inlets, formed at the portions of the two inner films coated with the heat resisting materials, and used for communicating with the air filling passage and the air columns; and 
 a plurality of heat-sealing blocks, adhering to the two outer films and the two inner films by means of heat sealing, and formed at sides of the air inlets, 
 wherein air entering the air-filling port expands the air filling passage, the two outer films are pulled apart outward in a longitudinal direction and are contracted in a transverse direction; the heat-sealing blocks thrust the two inner films, the portions of the two inner films coated with the heat resisting material are pulled apart outward in the longitudinal direction, and the third segments drive the two inner films to open the air inlet as the two outer films are pulled apart outward in the longitudinal direction; after entering the air column, the air presses the second sides of the two inner films to close the air column. 
 
     
     
       2. The mouth-blown air-sealed body with an automatically opened air inlet according to  claim 1 , wherein the two inner films adhere to each other through heat sealing between the neck heat-sealing line and the second side to form an air-filling passage, and the air-filling passage comprises:
 a collecting area, adjacent to the neck heat-sealing line and formed between two of the longitudinal heat-sealing lines, wherein one end of the collecting area protrudes toward the air filling passage; 
 a guiding area, connected to the collecting area; and 
 a shunting area, connected to the guiding area and the second side, wherein the shunting area comprises a plurality of outlets, and the outlets are smaller than a portion where the shunting area and the guiding area are connected. 
 
     
     
       3. The mouth-blown air-sealed body with an automatically opened air inlet according to  claim 1 , wherein the heat-sealing block comprises at least one air guiding portion, located at the air filling passage, and used for guiding air in the air filling passage to enter the air inlet. 
     
     
       4. The mouth-blown air-sealed body with an automatically opened air inlet according to  claim 3 , wherein the heat-sealing block comprises a positioning portion connected to the air guiding portion, and the air inlets is located at a side of the positioning portion. 
     
     
       5. The mouth-blown air-sealed body with an automatically opened air inlet according to  claim 4 , wherein the positioning portion or the air guiding portion adheres to the first sides of the two inner films and the two outer films. 
     
     
       6. The mouth-blown air-sealed body with an automatically opened air inlet according to  claim 1 , further comprising: a band, comprising a fixing end and a positioning end, wherein the fixing end is fixed at one end of the two outer films, and the length of the band is not less than the length of the two outer films in the transverse direction. 
     
     
       7. The mouth-blown air-sealed body with an automatically opened air inlet according to  claim 6 , wherein the width of the band is less than or equal to the width of the two outer films. 
     
     
       8. The mouth-blown air-sealed body with an automatically opened air inlet according to  claim 6 , further comprising: a tag, located on the band. 
     
     
       9. The mouth-blown air-sealed body with an automatically opened air inlet according to  claim 6 , wherein the band comprises a sticking part located at the positioning end.